esseling



March 19, 1957 L. A. ESSELING 2,736,167

v BLOCKING LAYER RECTIFIER Filed Nov. 7, 1955 2 Sheets-Sheet 1 INVENTOR LUDOVICUS AUGUSTINUS LAMBERTUS ESSELING AGENT March 19, 1957 A. L. ESSELING BLOCKING LAYER RECTIFIER 2 Sheets-Sheet 2 Filed NOV. 7, 1955 INVENTOR LUDOVICUS AUGUSTINUS LAMBERTUS ESSELING BY 1 AGENT 1 7 6 16 BLOCKING. LAYER- RECTIFIER Claims priority, application Netherlands November 6, 1954 6 Claims. or. 317- 234 The invention relates to blocking layer rectifiers provided with a box-shaped metalenvelope having'at least one flatwall and comprisinganfinsulating holder containing a number of rectifier elements which usually are arranged in stacks and are in heat-conducting contact with the fiat wall. Thisfiatwall is to be securedto a mounting plate which conducts away the heat liberated inithe rectifier. Usually the box-shaped envelope hasjniore'than'one fiat wall.

In known rectifiers of this kind the box is made of a bottom and a cover, which permitted,whenassembling the various parts, of stackingthe rectifiereleinentsfior example selenium rectifiers plates, inthe holder, of putting this holder on the bottomv and finally ofclosing the aggregate by means of the cover, the'elements being pressed '1 together at the same time.

In this construction along seam was produced between the bottom and the cover, which seam could only be sealed with difiiculty.

it is an object of the invention to provide a simple construction of a selenium rectifier provided with a moisturetight substantially metal envelope. The invention is based on recognition of the fact that it is not desirable for the envelope to consist of a bottom and a cover, since sealing two such parts involves difiiculty, and in addition on recognition of the fact that the envelope can be made very simple, if the rectifier elements are held by the insulating holder substantially in their final positions before the assembly is introduced into the envelope.

According to the invention the envelope comprises a length of tubing which is open at least at one end and contains an insulating holder having at least one chamber which is provided with at least one window which is arranged parallel to the fiat wall of the envelope and in which a metal closing plate is arranged which is in heatconducting contact on the one hand with the fiat wall and on the other hand with at least one of the rectifier elements contained in the chamber, said closing plates being pressed by spring pressure in the direction of the flat wall. whilst in addition the holder and the closing plate are provided with parts which prevent the closing plate from falling out of the holder when the latter is not arranged in the envelope. This closing plate may, if required, be a rectifier element.

The parts holding the closing plate may, for example, be studs, grooves formed in the window or tags secured to the closing plate and engaging parts of the holder.

Preferably the envelope consists of a tube of rectangular profile which may be provided with a bottom on one side. An open end of such a tube is preferably closed by means of a harden-able, liquid compound.

Mounting such rectifiers is very simple, since all parts contained in the envelope may be assembled previously to form a single unit which finally is moved into the envelope, after which the latter is closed by means of a compound in a manner which is well-known for condensers and other elements. When the assembly is moved into the nited States Patent clOs ingplates. ""Fig.-'5"i's"a diagrammatical cross-sectional view of an envelppe, the closing plate is slightly pressed back against Two embodiments of the invention will now be deribed in detail with reference to the accompanying Fig; 1 is a perspective view of a rectifier envelope and aninsulating holder. r r

Fig. 2 is a 'diagrammatical sectional view of a rectifier. figs. 3 and 4 are side views oftwo embodiments of alternativeembodiment;

"Bigi6 is apl'an-viewof the insulating holder and the parts containedth erein' of the alternative embodiment. jFigf'l' is"af'persp ective view of a closing plate as used in the construction of alternative embodiment.

Fig.1 shows an envelope 1 shaped in the form of a case of rectangular profile which is'closed at the rear. Along the sides'proyi'sion is made of flanges 2 by means of which 20* the enyelope'oan be secured'to a base plate or a chassis. S uch anf'ehvelopecan befextruded from aluminum. The

insulatipgfliolder Scorhprises a bottom 4 and a number of rtruding edges 5 which together form two chambers l igf2ishowsthe manner in which a number of rectifier elements 7 are stacked inithe chambers. Below each stack a bent lea f spfring tl'is arranged while a closing plate 9 is arranged ontop of each stack. Each closing plate engages the'lbwer side of bent over edges 10 of the holder windows which are formed by the edges'lll. Alternative embodiments which fall within the scope of the invention comprises the use of a fiat closing plate 11 and a metal spacing member 12, as is shown in Fig. 4. The closing plate 11, which may be a rectifier element, prevents the stack from falling out and the spacer 12 ensures a satisfactory thermal contact with the envelope 1.

In Fig. 2 this envelope 1 is shown on an enlarged scale for the sake of clearness. In actual fact it encloses the holder with a tight fit, on the understanding that a sufficient amount of space remains for arranging a thin insulating foil 13 over the closing plates.

Mounting these rectifiers is efiected in that the holder 3 together with everything it contains is assembled, after which the foil 13 is arranged upon it and finally the assembly is moved into the envelope 1 which should slightly compress the stacks.

Thereupon the envelope is closed by means of a hardenable compound 14 which is poured on a previously introduced insulating plate 15 which also carries 'a pair of contacts 16.

Figs. 5 to 7 show a similar embodiment in which. however, the holder consists of a simple frame 20 de fining two chambers and having two windows. Each chamber is closed by a closing plate 21 or 22 respectively which is provided with four tags 23 (Fig. '7) in a manner such that the tags of the lower closing plate 22 bear upon the upper side of the frame 20, while the tags 24 of the upper closing plates embrace the lower side of the frame. In each chamber two stacks of rectifier elements 25 are arranged which are pressed against the closing plate by a bent leaf spring 26. A metal plate 27 prevents the upper elements of the lower stacks from being damaged. Such plates 27, may, if desired, be interposed between all elements. The frame 20 may be provided with ribs 28 along the sides of the chambers in order to guide the tags 23 or 24 respectively of the closing plates and in order to prevent these plates from being displaced sideways. In addition, insulating foils 29, which prevent a short-circuit between the edges of the elements and the tags 23 or 24, are arranged on either side of the stacks.

The holder shown in Figs. 5 and 6 is moved into an gatented Mar. 19, 1957 3 envelope similarly to that shown in Figs. 1 and 2, an insulating foil 13 being used, if required, both on top of and under the elements.

In this construction the heat is conducted away at two sides; hence springs 26 are preferably interposed between the stacks.

Electric connections connecting the stacks to one 'another or to the terminals are not shown; they may be established in the usual manner by means of wires or leaf springs.

What is claimed is:

1. A rectifier assembly comprising a hollow, metal envelope having a fiat wall portion and an openingat one end, an insulating holder mounted within said envelope, said holder comprising wall portions defining a chamber having an aperture therein arranged substantially parallel to the said fiat Wall portion of said envelope, a plurality of rectifier elements mounted in the chamber of said. holder, and a metal closing plate coupled to said holder and overlying said aperture in the chamber and thermally coupled to said flat wall portion of said envelope and to at least one of said rectifier elements and being urged in the direction of said fiat wall portion of the envelope.

2. A rectifier assembly comprising a box-like, hollow, metal envelope having at least one flat wall portion and an Opening at least at one end, an insulating holder mounted Within said envelope, said holder comprising Wall portions defining at least one chamber having at least one aperture therein arranged substantially parallel to the said flat Wall portion of said envelope, a plurality of rectifier elements mounted in the chamber of said holder, and a metal closing plate detachably secured to said holder and overlying and closing off said aperture in the chamber and thermally coupled to said flat wall portion of said envelope and at least one of said rectifier elements and being urged against said fiat wall portion of the envelope.

3. An assembly as set forth in claim 2 wherein the closing plate is provided with extensions engaging the side of the holder remote therefrom. '7

4. A rectifier assembly comprising a box-like, hollow, metal envelope having at least one flat wall portion and :an openingat least at one end, an insulating holder mounted within said envelope, said holder comprising wall portions defining at least one chamber having at least one aperture therein arranged substantially parallel to the said fiat Wall portion of said envelope, a plurality of stacked rectifier elements mounted in the chamber of said holder, a metal closing plate detachably secured to said holder and overlying and closing oif said aperture in the chamber and thermally coupled to said flat wall portion of said envelope and to at least one of said rectifier elements, and means urging said rectifier elements against said closing plate and the latter against said flat wall portion of the envelope.

5. An assembly as set forth in claim 4 wherein the envelope comprises a tube-like member, and a hardenable material closes ofi one end of said tube-like member and seals in the holder.

6. An assembly as set forth in claim 4 wherein the holder has a flanged portion overlapping and engaging the closing plate and thus securing the latter to itself.

References Cited in the file of this patent UNITED STATES PATENTS 2,661,447 Hall Dec. 1, 1953 

